"The error:When i carry out the FeatureSelection"

New Altair Community Member
Updated by Jocelyn
When I carry out the FeatureSelection, there come out a error.
Error:Operator has 0 children, should be between 1 and infinity
I don't know what's this error, how to solve?
hoping you to give me some advices.
My configuration file:
<operator name="Root" class="Process" expanded="yes">
<operator name="TextInput" class="TextInput" expanded="yes">
<list key="texts">
<parameter key="graphics" value="D:\rm_workspace4.6\sample\data\20news\train\comp.graphics"/>
<parameter key="hardware" value="D:\rm_workspace4.6\sample\data\20news\train\comp.sys.ibm.pc.hardware"/>
</list>
<parameter key="default_content_language" value="english"/>
<parameter key="output_word_list" value="../data/training_words.md"/>
<list key="namespaces">
</list>
<operator name="StringTokenizer" class="StringTokenizer">
</operator>
<operator name="EnglishStopwordFilter" class="EnglishStopwordFilter">
</operator>
<operator name="TokenLengthFilter" class="TokenLengthFilter">
</operator>
<operator name="PorterStemmer" class="PorterStemmer">
</operator>
</operator>
<operator name="FeatureSelection" class="FeatureSelection" expanded="yes">
<parameter key="show_stop_dialog" value="true"/>
<parameter key="show_population_plotter" value="true"/>
</operator>
<operator name="LibSVMLearner" class="LibSVMLearner">
<parameter key="kernel_type" value="linear"/>
<list key="class_weights">
</list>
</operator>
<operator name="ModelWriter" class="ModelWriter">
<parameter key="model_file" value="../data/training_model.mod"/>
<parameter key="output_type" value="Binary"/>
</operator>
</operator>
Error:Operator has 0 children, should be between 1 and infinity
I don't know what's this error, how to solve?
hoping you to give me some advices.
My configuration file:
<operator name="Root" class="Process" expanded="yes">
<operator name="TextInput" class="TextInput" expanded="yes">
<list key="texts">
<parameter key="graphics" value="D:\rm_workspace4.6\sample\data\20news\train\comp.graphics"/>
<parameter key="hardware" value="D:\rm_workspace4.6\sample\data\20news\train\comp.sys.ibm.pc.hardware"/>
</list>
<parameter key="default_content_language" value="english"/>
<parameter key="output_word_list" value="../data/training_words.md"/>
<list key="namespaces">
</list>
<operator name="StringTokenizer" class="StringTokenizer">
</operator>
<operator name="EnglishStopwordFilter" class="EnglishStopwordFilter">
</operator>
<operator name="TokenLengthFilter" class="TokenLengthFilter">
</operator>
<operator name="PorterStemmer" class="PorterStemmer">
</operator>
</operator>
<operator name="FeatureSelection" class="FeatureSelection" expanded="yes">
<parameter key="show_stop_dialog" value="true"/>
<parameter key="show_population_plotter" value="true"/>
</operator>
<operator name="LibSVMLearner" class="LibSVMLearner">
<parameter key="kernel_type" value="linear"/>
<list key="class_weights">
</list>
</operator>
<operator name="ModelWriter" class="ModelWriter">
<parameter key="model_file" value="../data/training_model.mod"/>
<parameter key="output_type" value="Binary"/>
</operator>
</operator>